1 /******************************************************************************
3 * Module Name: tbfind - find table
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2008, Intel Corp.
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12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
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18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME("tbfind")
51 /*******************************************************************************
53 * FUNCTION: acpi_tb_find_table
55 * PARAMETERS: Signature - String with ACPI table signature
56 * oem_id - String with the table OEM ID
57 * oem_table_id - String with the OEM Table ID
58 * table_index - Where the table index is returned
60 * RETURN: Status and table index
62 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
63 * Signature, OEM ID and OEM Table ID. Returns an index that can
64 * be used to get the table header or entire table.
66 ******************************************************************************/
68 acpi_tb_find_table(char *signature
,
69 char *oem_id
, char *oem_table_id
, u32
*table_index
)
73 struct acpi_table_header header
;
75 ACPI_FUNCTION_TRACE(tb_find_table
);
77 /* Normalize the input strings */
79 ACPI_MEMSET(&header
, 0, sizeof(struct acpi_table_header
));
80 ACPI_STRNCPY(header
.signature
, signature
, ACPI_NAME_SIZE
);
81 ACPI_STRNCPY(header
.oem_id
, oem_id
, ACPI_OEM_ID_SIZE
);
82 ACPI_STRNCPY(header
.oem_table_id
, oem_table_id
, ACPI_OEM_TABLE_ID_SIZE
);
84 /* Search for the table */
86 for (i
= 0; i
< acpi_gbl_root_table_list
.count
; ++i
) {
87 if (ACPI_MEMCMP(&(acpi_gbl_root_table_list
.tables
[i
].signature
),
88 header
.signature
, ACPI_NAME_SIZE
)) {
90 /* Not the requested table */
95 /* Table with matching signature has been found */
97 if (!acpi_gbl_root_table_list
.tables
[i
].pointer
) {
99 /* Table is not currently mapped, map it */
102 acpi_tb_verify_table(&acpi_gbl_root_table_list
.
104 if (ACPI_FAILURE(status
)) {
105 return_ACPI_STATUS(status
);
108 if (!acpi_gbl_root_table_list
.tables
[i
].pointer
) {
113 /* Check for table match on all IDs */
116 (acpi_gbl_root_table_list
.tables
[i
].pointer
->signature
,
117 header
.signature
, ACPI_NAME_SIZE
) && (!oem_id
[0]
120 (acpi_gbl_root_table_list
.
126 || !ACPI_MEMCMP(acpi_gbl_root_table_list
.tables
[i
].
127 pointer
->oem_table_id
,
129 ACPI_OEM_TABLE_ID_SIZE
))) {
132 ACPI_DEBUG_PRINT((ACPI_DB_TABLES
,
133 "Found table [%4.4s]\n",
135 return_ACPI_STATUS(AE_OK
);
139 return_ACPI_STATUS(AE_NOT_FOUND
);
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